722.1 to 722.0 transmission problems please help. - Mercedes-Benz Forum

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post #1 of 24 (permalink) Old 04-08-2010, 04:52 PM Thread Starter
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Date registered: Mar 2010
Vehicle: 1975 240d w115.117
Location: Galveston Texas
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722.1 to 722.0 transmission problems please help.

See my stats to know what kind of car i have and transmission. I sent my transmission to a guy that took the valve body apart and did not know how to put it back together again. He then had me buy a used transmission just so he could get the valve body out of it, which I believe started my problem to begin with. There was no valve body in the transmission he had me buy, so he somehow found another one and installed it. He was an idiot. When I got the car back from him, I had to shift past drive and then back to drive again in order for the transmission to get in gear, and it would only go 55mph in 3rd.
I was sick of throwing money away, so I sent my car to a transmission guy out of town with the transmission I bought from the first guy in the trunk (722.0 minus a valve body). The transmission guy then installs the transmission in the trunk, which is a 722.0 type, 3 speed, in a motor that requires a 4 speed transmission (originally a 722.108).
It switches into 3rd gear at about 40mph and gets to about 55mph on level ground and 60mph downhill. I have spent many thousands of dollars on this car and I just need something to drive to college. I just got done spending 1400 dollars on the 722.0 transmission to get it overhauled. I had to take out a loan at my bank just to pay for it. Should he have overhauled the other 722.108 that was original to my car, that he was too lazy to find parts for? Should I send it back and make him do it right?
He called me this afternoon and told me it was an engine problem and the transmission works just fine... bull****.
Any technical help would be greatly appreciated. I plan to bring my car to him again tomorrow morning. He did give me a one year warranty.
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post #2 of 24 (permalink) Old 04-08-2010, 05:01 PM
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Give these guys a call and see what they recommend. They are extremely knowledgeable on all aspects of old MB's, especially transmissions. Let us know how things go.

Used Mercedes parts,rebuilt mercedes transmissions, new mercedes parts
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post #3 of 24 (permalink) Old 04-08-2010, 05:43 PM Thread Starter
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Thanks! I gave them a call and the guy on the phone said he would have the owner call me to see if he could help explain to me what I am dealing with. Very nice conversation. I will let you know how it goes.
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post #4 of 24 (permalink) Old 04-08-2010, 07:28 PM Thread Starter
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No call back... I'm beginning to lose my faith in humanity. Maybe I should learn how to fix it myself... it has been a long and frustrating journey with this car.
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post #5 of 24 (permalink) Old 04-08-2010, 08:29 PM
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Sorry about the problems you're having...I can't help with the technical aspect of it but I would recommend you give these shops that ripped you off a little bit of hell. Forget the BBB (they work for the companies and have no interest in advocating your side, ever), check with various Texas state, county and city governmental agencies. File complaints, seek compensation and sue in small claims if you have to. I had a warranty issue a few months ago and here in California the state waived many charges since I was unemployed.

Regarding the call-back, most shops dont...you gotta bug them quite a bit to stay in contact and/or keep up with what they're doing. Also, shop around if you're going to dump money into the car...you have nothing to lose.

I'm mechanically inclined and was tempted to do the timing chain myself. I could have but the problem is that sometimes 'half knowledge' gets you into deeper troubles. If you go off of assumptions, such as experience or instructions, you might miss something critical and cause other damage. With the transmission, I wouldn't "do it yourself". I recommend you buy a beater car for under a grand for daily driving around.

Former MB: "Miss Juliana" - 1972 280SEL 4.5
Current MB: 2013 C250
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post #6 of 24 (permalink) Old 04-09-2010, 08:30 PM Thread Starter
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The transmission shop insists that it is an engine problem, but I don't have any more money left to send it to a engine specialist. It changes from first to 2nd at 25 mph and 2nd to 3rd at 40. It doesn't go faster than 55 or 60 max. I am wondering what could be the problem with my car? I got a hold of someone at sun valley transmission at the link above in california and talked to their owner today. He said it sounded like I had a fuel problem or a fuel line leak. There was air in the clear plastic in line filter, but no bubbles. Is this normal? I replaced all of the fuel lines today with new tubes and both in line and canister filters. I took it for a test drive and still does not get above 60 mph downhill. What could be the problem here? I really need help in fixing this, since this will be my primary car to drive for clinicals. I am in line to be a registered nurse and need it for my education and future. Is it an engine problem like the transmission people say or is it a transmission problem and is the transmission guy pulling my leg?
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post #7 of 24 (permalink) Old 04-12-2010, 04:50 PM
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For the engine: What does it do (how does it act) when it gets up to 55-60 mph? Does it flatten out? Sound like it's starving for fuel? Any bucking, popping, or missing? Have you checked any engine components? Have you changed the fuel filter(s) lately?

For the transmission: Is the fluid level correct? How does it shift....hard, soft, slipping (engine RPM flare when shifting)? As far as I know all the early MB's shifts are controlled by mechanical throttle pressure linkage and a vacuum modulator. I don't know if this is true on the diesels though. Someone chime in on this. If this linkage is adjusted incorrectly you can get early, soft (maybe even slipping) shifts, or hard, late shifts. If it's way off toward late shifts it is possible to not get to a high enough speed/RPM to make it shift into 4th gear. Be aware that most "older" cars with automatic transmissions used similar linkage setups, some with a vacuum modulator and some without. If the engine is running poorly, they usually shift very hard and late and, as a result, may not be able to get into top gear. Give us as complete a description as you can on both engine and transmission operation.
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post #8 of 24 (permalink) Old 04-12-2010, 05:12 PM
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WOW, it sounds like some really stupid people have been playing around with your car.

First off, I don't think you have an engine problem. The problem is that you have a 3 speed tranny in a car that needs a 4 speed. Your just hitting the limiter(4350 RPM) at 60 MPH......

What was your original problem which made you want to replace the tranny? You need to get your original tranny back, put the valve body back together and re-install it in the car. If you can't put the valve body back together get a MB person to do it, not some random tranny shop.

Your car has a transmission control pressure rod that control when the tranny shifts. Your model doesn't use a vacuum modulator.

'79 280CE with 226,000 miles
'76 240D 4 speed with 190,000
'85 300D Turbo with 266,000 miles


GONE but not forgotten
'76 300D with 195,300 miles
"83 300D with 174,000 miles

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post #9 of 24 (permalink) Old 04-12-2010, 10:25 PM Thread Starter
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Man, thats some excellent advice. Thanks so much!
The original problem was that the car was flooded during a hurricane that came through a year and a half ago... hurricane ike, galveston tx. So its a limiter... I knew it wasn't an engine problem.
When it gets to 55 or 60 it acts like the engine is just fine and the transmission sounds like it is in the upper half of the gear and that it could use another shift, but it runs super smooth. I changed the fuel filter and in line filter with no success.
During shifts I get up to speed and there is a pause where the pitch of the whirr in the transmission is consistent, and as the gear shifts there is a dropping tone to the next gear. After that there is more acceleration. I don't think there is any flaring. Smooth shifts. No missing at all.
I took it to a place called cedes on highway 3. They are the nicest people I have dealt with. They looked at it for free and told me that it was most likely a transmission for a gasoline engine, and not compatible for the diesel engine. He also said they rigged the vacum modulator to the vacum pump, which can cause problems if the original transmission was pressure rod controlled.
I am going back over there tomorrow with this information. If he isn't willing to budge I will take him to small claims court and get every penny back.
A lot of thanks to you both!
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post #10 of 24 (permalink) Old 04-13-2010, 02:39 PM
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The diesels of this time did not have a vacuum modulator. I also think you have a gasser transmission in your car, prolly from a W116 or R107.

Good luck, I hope you get your car back to its original running order soon.

'79 280CE with 226,000 miles
'76 240D 4 speed with 190,000
'85 300D Turbo with 266,000 miles


GONE but not forgotten
'76 300D with 195,300 miles
"83 300D with 174,000 miles

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